The costs displayed here are the buy prices. Not all weapons can be bought in stores and sell prices are calculated as half the buy price. Some weapons cannot be sold at all. All characters have at least two weapons with double Materia growth. It is also possible to find one weapon with no Materia slots for each character; those can be considered "joke weapons" due to their unusual models, such as Cloud's Nail Bat and Cid's Mop, however, they're usually far more powerful than the weapons the party can access at that given point. All ultimate weapons, except for Aeris's Princess Guard, have zero Materia growth. Ultimate weapons have unique damage formlae